Remove notice and collection of user agent from feedback paths.

Other session headers such as 'Accept-Language' are still collected.
Merge pull request #122 from jbarrett/remove-ua-feedback

Remove notice and collection of user agent from feedback paths.
DDGC::Manual::Development - developer intro
Will I ever learn POD?
Update Install.pod

few changes in wording, no biggie (yo)
Update Development.pod

Again, ch-ch-ch-changes. Bowie would be so proud.